# CVE-2026-96432: Qt null pointer dereference in QNetworkAccessManager HTTP/2

Source: https://junglewise.ai/threats/cve-2026-96432-a-malicious-or-compromised-http-2-server-withholding-settings-ack  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-26. Updated: 2026-10-26  
License: CC BY 4.0 with a link back

CVE-2026-96432 · Severity: info · Published 2026-10-26

Qt Network's HTTP/2 implementation in QNetworkAccessManager can be crashed by a malicious or compromised HTTP/2 server. An attacker sends specific HTTP/2 protocol messages that cause a null pointer dereference, crashing any application that uses this library for network communication. This results in denial of service, making affected applications temporarily unavailable.

Technologies: [Qt Group Qt](https://junglewise.ai/threats/technologies/qt-group-qt). Vendors: [Qt Group](https://junglewise.ai/threats/vendors/qt-group).

## Quick answers

**Is CVE-2026-96432 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-96432 being exploited in the wild.

**How severe is CVE-2026-96432?** Informational severity, published 26 October 2026.

**Which products and versions are affected?** Qt Group Qt 6.8.0 to 6.8.9, 6.9.0 to 6.11.2.

**Is there a fix for CVE-2026-96432?** Yes: fixed in Qt 6.8.10, Qt 6.11.3. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-96432 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-96432?** Check whether you run Qt Group Qt at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in Qt 6.8.10, Qt 6.11.3

## Technical details

A malicious HTTP/2 server can craft a sequence of protocol messages—withholding SETTINGS ACK, then sending RST_STREAM on a completed stream followed by PUSH_PROMISE—that triggers a null pointer dereference in QNetworkAccessManager's HTTP/2 handling code. The vulnerability requires network connectivity to an attacker-controlled HTTP/2 server; no authentication, special privileges, or user interaction beyond normal application operation are needed. The result is a crash (denial of service) with no data disclosure or code execution.

## Affected products

- Qt Group Qt 6.8.0 to 6.8.9, 6.9.0 to 6.11.2

## Timeline

- 2026-10-26: advisory

## References

- [https://codereview.qt-project.org/c/qt/qtbase/+/759718](https://codereview.qt-project.org/c/qt/qtbase/+/759718)
- [https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products](https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products)

## Related threats

- [Qt Network QAuthenticator NTLM out-of-bounds read](https://junglewise.ai/threats/cve-2026-105946-out-of-bounds-read-in-the-qauthenticator-ntlm-authentication)
- [Qt stack exhaustion in QXmlStreamReader::readElementText](https://junglewise.ai/threats/cve-2026-78253-uncontrolled-recursion-in-qxmlstreamreader-readelementtext-in-qt)